disston



(No Model.)

T. s. DISSTON.

I SAW. No. 367,605. Patented Aug. 2, 1887-.

FIG/.1.

UNITED STATES PATENT OFFIC THOMAS S. DISSTON, OF PHILADELPHIA,PENNSYLVANIA, ASSIGNOR TO Q HAMILTON DISSTON, HORACE C. DISSTON,\VILLIAM DISSTON, AND

JACOB S. DISSTON, ALL OF SAME PLACE.

SAW.

SPECIFICATION forming part of Letters Patent No. 367,605 dated August 2,1887.

Application filed December 14, 1886. Serial No. 221,554. (No model.)

To all whom it may concern:

Be it known that I, THOMAS S. DISSTON, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Saws. of which the following is a specification.

One object of my invention is to so make a combined right and lefthanded compass-saw that the blades can be compactly folded into thehandle, a further object being to so 0011- struct the blade of the sawthat it will cut in a straight line as well as in a curve.

In the accompanying drawings, Figure 1 is a side view of my improvedcompass-saw with one of the blades extended. Fig. 2 is a rear view withthe blades folded in the handle. Fig. 3 is a section on the line 1 2,Fig. 2. Figs. 4.- and 5 are detached perspective views of the butt-endsof the two blades; and Figs. 6, 7, and 8 are diagrams illustrating thedifferent cuts which can be made with the saw.

The ordinary flatside'd compass-saw is not well adapted for cuttingshort curves, and

this known defect has led to the devising of a saw having a bladetapering from the center toward each end and concavo-couvex incross-section, except at the central portion, where it is secured to thehandle, one half of the blade being constructed to cut a righthand curveand the other half to cut a lefthand curve. One-half of the length ofthe saw in this case always projected beyond the handle, and renderedthe implement inconvenient to carry in the pocket; but a more seriousobjection to this construction was that, owing to the concavo-convexcross-sectional form of the two portions of the blade, it was impossibleto cut in a straight line with the saw. I overcome these objections byc011- structing the saw in the manner shown in the drawings.

A is the handle, grooved at a a, as shown in.Figs. 2 and 3, for thereception of the saw blades 13 B, which are pivoted to the upper portionof the handle by a bolt, 1), provided with a suitable thumb-nut, c. Thegrooves a. a are tapered, leaving a tapered portion or fillet, a againstwhich the saw-blades rest when folded into the handle.

The sawblades are so pivoted that the teeth will be on the inside whenthe saw-blades are folded into the handle, a stop, d, on the blade B,fitting into a recess, 6, in the blade B, to limit the inward movementof both blades, and said step d entering a recess, f, near the end ofthe blade B, Figs. 3 and 4, so as to limit the outward movement of theblades and act with the bolt 1) and fillet a to provide adouble supportfor the saw when cutting.

Each of the blades B B is flat on one side and convex on the oppositeside, the convex side of the saw guiding the same in cutting curves, asshown in Figs. 6 and 7, and the flat side serving as the guide incutting in a straight line, as in Fig. 8. The blades are the oppositesof each other, as regards their flat and convex sides, so that one bladeis adapted for cutting right-hand curves while,

the other is adapted to cut left-hand curves, either blade beingavailable for cutting in a straight line, as shown.

I claim as my invention 1. The combination of the handle A, recessed toform a tapering tillet, a-, with two saw-blades pivoted to the handle,one having a stop to bear against the other blade when either isextended, whereby the extended blade will have a firm bearing in thehandle, substantially as set forth.

2. The combination of the recessed handle and the two saw-blades pivotedthereto, one blade having a stop lug or pin and the other blade havingtwo recesses, one of which recei ves the pin when the blades are foldeddown into the handle, the other recess receiving said pin when either ofthe blades is extended, all substantially as specified.

3. A compass-saw blade having one side fiat.

and the other side convex, all substantially as specified.

4. The combination of a recessed handle with two saw blades pivotedthereto and each having one side flat and the other side convex, thesaws being the reverse of each other as regards their flat and convexsides, all substan tially as specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

THOS. S. DISSTON. IVitnesses:

VVILLIAM D. CONNER, HARRY SMITH.

